Marin Cilic, of Croatia, waves to the crowd after defeating Guido Pella, of Argentina, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles ... more 
Marin Cilic, of Croatia, waves to the crowd after defeating Guido Pella, of Argentina, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) less 
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Associated Press | Photo By Charles Krupa
Mon, Aug 31, 2015 7:15 PM EDT